Who is Gwen MacGregor from Rebellion and what is their importance?

Gwen MacGregor is considered the family's angel. She has a gift for healing, and she knows about herbal remedies, as well as general medical care. Unlike Serena, Gwen is demure, young woman with her mother's mild temperament. Initiallym she is attracted to Brigham, but later walks in on Brigham and Serena kissing in the kitchen. She bravely nurses several family members' wounds and helps with the difficult birth of Maggie's baby. In the end, she leaves for the New World with her sister and brother, leaving her mother, Coll, and Maggie behind.